Using a sticky piston and a composter, you can go through walls

Place a button next to you.  Then place down two red stone dusts that connect to a sticky piston that is two blocks away. Then place a composter or a caldron in front of the piston. Lastly, place a two block high post behind you and next to you and a place a block above the button and a block above the composter or caldron. Then press the button and it will pull you through the block. (If you are crouching this will not work.).